Improvement in the purification of animal-charcoal



dlnitcd swa mm 63mins.

NEW Y0RK,'N. Y.

- CARL FRIEDRICH LUDVVIG \VANDEL, OF WALDAU, BERNBURG, NORTH GERMANCONFEDERATION, ASSIGNOR TO F. .O. MATTHIESSEK AND \V. A. WIECHERS, OF

.T-mm Patent No. 90,617, dated Jlfay 2.3, 1869.

' The Schedule referred to in these Letters Patent and making part ofthe same.

And I do hereby declare that the following is a full, clear, and exactdescription of the same, and of the manner of operating therewith.

Animal-charcoal, when used in the decolorization of fluids, assugar'liquois, sirups, alcohol, oil, &c., be-

comes charged with foreign matters it absorbed and removed from saidfluids, and which fill and obstruct the pores of the charcoal, renderingit unfit for further use until such foreign matters be reme ed. Thesematters, as far as they consist of soluble salts, may be washed out bywater. Lime may be removed by various acids, as hydrochloric or aceticacid; and the main portion of organic matter may be removed by hot orcold water, by various acids, or by alkalines, as potash or soda; but,for-the removal of the remnants of these organic matters, the meanshitherto known have shown themselves to be generally insufiicient.

These remained in the'charcoal or bone-black, and became carbonized inthe fulther act (if revivification, viz, the re-burning of the charcoal.The presence of carbon in the bone-black, thus resulting from aninsufficient revivification, accumulating every time the bone-black isused, and which, to eii'ectually remove,

' no means have hitherto been known, obstructs the minute pores of saidbone-black, renderiu g it valueless for revivifyiug-purposes, andinvolving serious expenses to the manufacturer.

My invention consists in the removal of the superfluous carbon in thebone-black by the use of, as strong oxidizers, the alkaline salts ofmanganese, which may.

be produced by combining soda or potash with oxide of manganese orliypcrmaugnnesc, either of such inanganese-salts answering the desiredpurpose. For this, purpose, the bone-black is submitted to the ordinaryprocess of reviviiication, and, being put into suitable vessels, of ironor copper, is treated with one of the above-named manganese-salts, forwhich purpose'tbe salt is dissolved in water, the latter being insuliicicnt quantity to cover the bone-black in the vessel. Then thesolution is poured on the bone-black, and heated slowly to theboiling-point, which is continued for about one-half hour, more or less,after which the liquid is allowed to flow ofi.

During this procedure, the abovc-named salts are reduced to peroxide orhyperoxide of manganese, and carbonate of sodium or potassium,respectively, while the carbon of the bone-black has become oxidized.

For the removal of these substances, the bone-black is then treated withwater and inuriatic acid. Thus the liquid drawn ofi' from the bone-blackis replaced by a sufiicient quantity of water, in order to wash it. Thenthe muriatic acid is added to the water, for the removal of the peroxideor hyperoxide of manganese. After this, the bone-black is again washedwith water, when it is ready for re-buming.

One per cent, of either of the above salts is sufli cient for every percent. of carbon to be removed, while two per cent. of muriatic acid isnecessary for eachper cent. of the salt employed.

What is here claimed, and desired to be secured by Letters Patent, is--The use of the. above-named salts, as oxidizers, in the revivificationof animal-charcoal, substantially as specified.

This specification signed by me, this 12th day of January, 1869.

CARL FRIEDRICH LUDWIG WAN DEL.

Witnesses: V

0m HEINRICH KNUOP, EDWARD Jvsros Tuonn.

